While plenty of great nature photographers are professionals, it seems only logical that having a professional knowledge of the species you're shooting would only help make your images that much more powerful. Marine biologist Alexander Semenov's stunning underwater photos prove to be ultimate proof of this concept—particularly when it comes to jellyfish.

Indeed, all of the images from his "Underwater Experiment" series—you can see more of them at io9—show that maybe it really does take a marine biologist to truly capture the unbelievable beauty of life under the sea.